Robtex

Up: 72.128.0.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 72.128.0.0/19
Down right: 72.128.32.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.128.0.0	PTR	cpe-72-128-0-0.kc.res.rr.com
72.128.4.126	PTR	cpe-72-128-4-126.kc.res.rr.com
72.128.4.129	A	cpe-72-128-4-129.kc.res.rr.com
72.128.4.168	A+PTR	cpe-72-128-4-168.kc.res.rr.com
72.128.4.196	A+PTR	cpe-72-128-4-196.kc.res.rr.com
72.128.5.65	A	mail.ineffable.me
72.128.5.120	A+PTR	cpe-72-128-5-120.kc.res.rr.com
72.128.5.160	A+PTR	cpe-72-128-5-160.kc.res.rr.com
72.128.5.209	A	cpe-72-128-5-209.kc.res.rr.com
72.128.6.118	A	cpe-72-128-6-118.kc.res.rr.com
72.128.7.5	A+PTR	cpe-72-128-7-5.kc.res.rr.com
72.128.7.30	PTR	cpe-72-128-7-30.kc.res.rr.com
72.128.8.65	PTR	cpe-72-128-8-65.kc.res.rr.com
72.128.16.133	A	technobug.com
72.128.16.200	A+PTR	cpe-72-128-16-200.kc.res.rr.com
72.128.16.207	A	cpe-72-128-16-207.kc.res.rr.com
72.128.16.208	A+PTR	cpe-72-128-16-208.kc.res.rr.com
72.128.16.209	A	cpe-72-128-16-209.kc.res.rr.com
72.128.17.0	PTR	cpe-72-128-17-0.kc.res.rr.com
72.128.17.2	A+PTR	cpe-72-128-17-2.kc.res.rr.com
72.128.17.7	A	cpe-72-128-17-7.kc.res.rr.com
72.128.17.11	A	cpe-72-128-17-11.kc.res.rr.com
72.128.17.16	A	cpe-72-128-17-16.kc.res.rr.com
72.128.17.68	A	cpe-72-128-17-68.kc.res.rr.com
72.128.17.127	A	cpe-72-128-17-127.kc.res.rr.com
72.128.17.138	A	cpe-72-128-17-138.kc.res.rr.com
72.128.17.147	A	cpe-72-128-17-147.kc.res.rr.com
72.128.17.158	A	cpe-72-128-17-158.kc.res.rr.com
72.128.17.167	A	cpe-72-128-17-167.kc.res.rr.com
72.128.17.192	A	cpe-72-128-17-192.kc.res.rr.com
72.128.17.194	PTR	cpe-72-128-17-194.kc.res.rr.com
72.128.17.197	A	cpe-72-128-17-197.kc.res.rr.com
72.128.17.199	A	cpe-72-128-17-199.kc.res.rr.com
72.128.17.201	A	cpe-72-128-17-201.kc.res.rr.com
72.128.18.2	PTR	cpe-72-128-18-2.kc.res.rr.com
72.128.18.17	A	innotechadvancements.com
72.128.18.200	A+PTR	cpe-72-128-18-200.kc.res.rr.com
72.128.18.238	PTR	cpe-72-128-18-238.kc.res.rr.com
72.128.19.32	A	cpe-72-128-19-32.kc.res.rr.com
72.128.19.130	A	cpe-72-128-19-130.kc.res.rr.com
72.128.20.6	A	cpe-72-128-20-6.kc.res.rr.com
72.128.20.38	A	cpe-72-128-20-38.kc.res.rr.com
72.128.20.48	A	cpe-72-128-20-48.kc.res.rr.com
72.128.20.105	A	cpe-72-128-20-105.kc.res.rr.com
72.128.20.240	A	cpe-72-128-20-240.kc.res.rr.com
72.128.21.12	A	cpe-72-128-21-12.kc.res.rr.com
72.128.21.43	A	cpe-72-128-21-43.kc.res.rr.com
72.128.21.46	A	cpe-72-128-21-46.kc.res.rr.com
72.128.21.66	A+PTR	cpe-72-128-21-66.kc.res.rr.com
72.128.21.104	A	cpe-72-128-21-104.kc.res.rr.com
72.128.21.110	A	cpe-72-128-21-110.kc.res.rr.com
72.128.21.159	A	cpe-72-128-21-159.kc.res.rr.com
72.128.21.201	A	cpe-72-128-21-201.kc.res.rr.com
72.128.22.52	A	cpe-72-128-22-52.kc.res.rr.com
72.128.22.224	A+PTR	cpe-72-128-22-224.kc.res.rr.com
72.128.24.71	A+PTR	cpe-72-128-24-71.kc.res.rr.com
72.128.24.71	A	anotherwallsthing.com
72.128.26.2	PTR	cpe-72-128-26-2.kc.res.rr.com
72.128.26.137	A+PTR	cpe-72-128-26-137.kc.res.rr.com
72.128.26.137	A	buildingengineernetwork.com
72.128.28.2	PTR	cpe-72-128-28-2.kc.res.rr.com
72.128.28.73	A	pencricket.com
72.128.29.252	A+PTR	cpe-72-128-29-252.kc.res.rr.com
72.128.30.46	A+PTR	cpe-72-128-30-46.kc.res.rr.com
72.128.30.46	A	raineoriginal.com
72.128.30.69	PTR	cpe-72-128-30-69.kc.res.rr.com
72.128.30.121	A+PTR	cpe-72-128-30-121.kc.res.rr.com
72.128.30.121	A	russrudduck.com
72.128.30.156	A+PTR	cpe-72-128-30-156.kc.res.rr.com
72.128.30.191	PTR	cpe-72-128-30-191.kc.res.rr.com
72.128.31.85	A	cpe-72-128-31-85.kc.res.rr.com
72.128.31.211	A	cpe-72-128-31-211.kc.res.rr.com
72.128.31.249	A	cpe-72-128-31-249.kc.res.rr.com
72.128.31.251	A	cpe-72-128-31-251.kc.res.rr.com
72.128.31.255	A	cpe-72-128-31-255.kc.res.rr.com
72.128.32.0	PTR	cpe-72-128-32-0.kc.res.rr.com
72.128.34.237	A	blog.derekcreason.com
72.128.38.101	PTR	cpe-72-128-38-101.kc.res.rr.com
72.128.39.142	A+PTR	cpe-72-128-39-142.kc.res.rr.com
72.128.40.0	A+PTR	cpe-72-128-40-0.kc.res.rr.com
72.128.40.93	A+PTR	cpe-72-128-40-93.kc.res.rr.com
72.128.40.138	A+PTR	cpe-72-128-40-138.kc.res.rr.com
72.128.40.235	PTR	cpe-72-128-40-235.kc.res.rr.com
72.128.40.235	A	jmahurin.com
72.128.40.235	A	gannridgefarms.com
72.128.41.76	A+PTR	cpe-72-128-41-76.kc.res.rr.com
72.128.42.49	A+PTR	cpe-72-128-42-49.kc.res.rr.com
72.128.42.49	A	beyondmygrave.com
72.128.43.0	A+PTR	cpe-72-128-43-0.kc.res.rr.com
72.128.43.0	A	mobilesynd.com
72.128.43.89	A	blog.derekcreason.com
72.128.43.89	A	derekcreason.com
72.128.43.240	PTR	cpe-72-128-43-240.kc.res.rr.com
72.128.43.240	A	reallendingtools.com
72.128.43.240	A	occhid.com
72.128.44.0	A+PTR	cpe-72-128-44-0.kc.res.rr.com
72.128.44.229	A	mail.beltonremembers.org
72.128.45.152	A	haverkamp.us
72.128.47.83	A+PTR	cpe-72-128-47-83.kc.res.rr.com
72.128.47.83	A	ethanpresley.com
72.128.47.104	PTR	cpe-72-128-47-104.kc.res.rr.com
72.128.47.104	A	windingroadretreat.com
72.128.47.104	A	screenprintsplus.com
72.128.47.183	A+PTR	cpe-72-128-47-183.kc.res.rr.com
72.128.50.69	PTR	cpe-72-128-50-69.kc.res.rr.com
72.128.52.149	PTR	cpe-72-128-52-149.kc.res.rr.com
72.128.53.109	A+PTR	cpe-72-128-53-109.kc.res.rr.com
72.128.56.29	A	cpe-72-128-56-29.kc.res.rr.com
72.128.56.73	A+PTR	cpe-72-128-56-73.kc.res.rr.com
72.128.57.219	A+PTR	cpe-72-128-57-219.kc.res.rr.com
72.128.63.100	A	polexus.com